<template>
	<el-container class="home-container">
		
	  <!-- 头部区域 -->
	  <el-header>
		<div>
			<img src="../assets/heima.png" alt="">
			<span>电商后台管理系统</span>
		</div>
		<el-button type="info" @click="logout">退出</el-button>
	  </el-header>
	  
	  <!-- 页面主体区域 -->
	  <el-container>	  
		<!-- 侧边栏 -->  
	    <el-aside :width="isCollapse ? '64px' : '200px'">
			<!-- 折叠展开按钮 -->
			<div class="toggle-button"
			@click="toggleCollapse">|||</div>
			
			<!-- 侧边栏菜单区域 -->
			<el-menu
			      background-color="#333744"
			      text-color="#fff"
			      active-text-color="#409EFF"
				  :unique-opened="true"
				  :collapse="isCollapse"
				  :collapse-transition="false"
				  :router="true"
				  :default-active="activePath">
				  
				  <!-- 一级菜单 -->
			      <el-submenu 
				  :index="item.id + ''"
				  v-for="item in menulist" :key="item.id">
					<!-- 一级菜单的模板区域 -->  
			        <template slot="title">
					  <!-- 图标 -->
			          <i :class="iconsObj[item.id]"></i>
					  <!-- 文本 -->
			          <span>{{item.authName}}</span>
			        </template>
					
					<!-- 二级菜单 -->
			        <el-menu-item 
					:index="'/' + subItem.path"
					v-for="subItem in item.children" 
					:key="subItem.id"
					@click="saveNavState('/' + subItem.path)">
						<!-- 二级菜单的模板区域 -->
						<template slot="title">
						  <!-- 图标 -->
						  <i class="el-icon-menu"></i>
						  <!-- 文本 -->
						  <span>{{subItem.authName}}</span>
						</template>
					</el-menu-item>
			      </el-submenu>
			    </el-menu>
		</el-aside>
		
		<!-- 右侧内容主体 -->
	    <el-main>
			<!-- 路由占位符 -->
			<router-view></router-view>
		</el-main>
	  </el-container>
	</el-container>
</template>

<script>
	export default {
		name: 'Home',
		data(){
			return {
				menulist: [],
				iconsObj: {
					'125': 'iconfont icon-user',
					'103': 'iconfont icon-tijikongjian',
					'101': 'iconfont icon-shangpin',
					'102': 'iconfont icon-danju',
					'145': 'iconfont icon-baobiao'
				},
				isCollapse: false,
				activePath: ''
			}
		},
		methods: {
			logout(){
				window.sessionStorage.clear()
				this.$router.push('/login')
			},
			//获取菜单数据
			async getMenuList(){
				const { data: res } = await this.$http.get('menus')
				//console.log(res)
				if(res.meta.status !== 200){
					this.$message.error(res.meta.msg)
				}else{
					this.menulist = res.data
					//console.log(this.menulist)
				}
			},
			//折叠或展开侧边栏菜单
			toggleCollapse(){
				this.isCollapse = !this.isCollapse
			},
			//保存当前激活的菜单项的路由跳转地址到sessionStorage中
			saveNavState(activePath){
				this.activePath = activePath
				window.sessionStorage.setItem('activePath', activePath)
			}
		},
		created(){
			this.getMenuList()
			this.activePath = window.sessionStorage.getItem('activePath')
		}
	}
</script>

<style lang="less" scoped="scoped">
	.el-header {
		display: flex;
		justify-content: space-between;
		align-items: center;
		padding-left: 0;
		font-size: 20px;
		color: #fff;
		background-color: #373d41;
		
		> div {
			display: flex;
			align-items: center;
			
			span {
				margin-left: 15px;
			}
		}
	}
	.el-aside {
		background-color: #333744;
		
		.el-menu {
			border-right: none;
		}
	}
	.el-main {
		background-color: #eaedf1;
	}
	.home-container {
		height: 100%;
	}
	.iconfont {
		margin-right: 8px;
	}
	.toggle-button {
		background-color: #4A5064;
		font-size: 10px;
		line-height: 24px;
		color: #fff;
		text-align: center;
		letter-spacing: 0.2em;
		cursor: pointer;
	}
</style>
